These Rocks Have Been Changed!
Map data: 2013 Google, 2013 DigitalGlobe
Location of the Slickenside Rocks
near Wrightwood, CA in the San Gabriel Mountains.
34.38 latitude, -117.71 longitude
The San Andreas Fault cuts right into this area. The rocks along the edges of the fault get rubbed past each other, creating a polished side, while the other side remained normal.